Integrate LLVM at llvm/llvm-project@6c4267fb1779

Updates LLVM usage to match
[6c4267fb1779](llvm/llvm-project@6c4267fb1779)

PiperOrigin-RevId: 689129594

third_party/llvm/generated.patch

@@ -1,44 +1,43 @@
 Auto generated patch. Do not edit or delete it, even if empty.
-diff -ruN --strip-trailing-cr a/lldb/source/Utility/DiagnosticsRendering.cpp b/lldb/source/Utility/DiagnosticsRendering.cpp
---- a/lldb/source/Utility/DiagnosticsRendering.cpp
-+++ b/lldb/source/Utility/DiagnosticsRendering.cpp
-@@ -99,10 +99,10 @@
+diff -ruN --strip-trailing-cr a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
+--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
++++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
+@@ -50049,8 +50049,9 @@
+   SDValue X, Y, Z;
+   if (sd_match(N, m_And(m_Value(X),
+                         m_OneUse(m_Or(m_Value(Y), m_Not(m_Value(Z))))))) {
+-    // Don't fold if Y is a constant to prevent infinite loops.
+-    if (!isa<ConstantSDNode>(Y))
++    // Don't fold if Y or Z are constants to prevent infinite loops.
++    if (!DAG.isConstantIntBuildVectorOrConstantInt(Y) &&
++        !DAG.isConstantIntBuildVectorOrConstantInt(Z))
+       return DAG.getNode(
+           ISD::AND, DL, VT, X,
+           DAG.getNOT(
+diff -ruN --strip-trailing-cr a/llvm/test/CodeGen/X86/pr108731.ll b/llvm/test/CodeGen/X86/pr108731.ll
+--- a/llvm/test/CodeGen/X86/pr108731.ll
++++ b/llvm/test/CodeGen/X86/pr108731.ll
+@@ -192,3 +192,23 @@
+   ret void
+ }
 
-   // Sort the diagnostics.
-   auto sort = [](auto &ds) {
--    llvm::sort(ds.begin(), ds.end(), [](auto &d1, auto &d2) {
-+    std::stable_sort(ds.begin(), ds.end(), [](auto &d1, auto &d2) {
-       auto l1 = d1.source_location.value_or(DiagnosticDetail::SourceLocation{});
-       auto l2 = d2.source_location.value_or(DiagnosticDetail::SourceLocation{});
--      return std::pair(l1.line, l2.column) < std::pair(l1.line, l2.column);
-+      return std::tie(l1.line, l1.column) < std::tie(l2.line, l2.column);
-     });
-   };
-   sort(remaining_details);
-diff -ruN --strip-trailing-cr a/lldb/unittests/Utility/DiagnosticsRenderingTest.cpp b/lldb/unittests/Utility/DiagnosticsRenderingTest.cpp
---- a/lldb/unittests/Utility/DiagnosticsRenderingTest.cpp
-+++ b/lldb/unittests/Utility/DiagnosticsRenderingTest.cpp
-@@ -46,16 +46,20 @@
-     std::string result =
-         Render({DiagnosticDetail{loc2, eSeverityError, "X", "X"},
-                 DiagnosticDetail{loc1, eSeverityError, "Y", "Y"}});
--    ASSERT_LT(StringRef(result).find("Y"), StringRef(result).find("X"));
-+    // Unintuitively the later diagnostic appears first in the string:
-+    //    ^   ^
-+    //    |   second
-+    //    first
-+    ASSERT_GT(StringRef(result).find("Y"), StringRef(result).find("X"));
-   }
-   {
-     // Test that diagnostics in reverse order are emitted correctly.
--    SourceLocation loc1 = {FileSpec{"a.c"}, 2, 10, 0, false, true};
-+    SourceLocation loc1 = {FileSpec{"a.c"}, 1, 10, 0, false, true};
-     SourceLocation loc2 = {FileSpec{"a.c"}, 1, 20, 0, false, true};
-     std::string result =
-         Render({DiagnosticDetail{loc2, eSeverityError, "X", "X"},
-                 DiagnosticDetail{loc1, eSeverityError, "Y", "Y"}});
--    ASSERT_LT(StringRef(result).find("Y"), StringRef(result).find("X"));
-+    ASSERT_GT(StringRef(result).find("Y"), StringRef(result).find("X"));
-   }
-   {
-     // Test that range diagnostics are emitted correctly.
++define void @PR113240(i64 %a) {
++; CHECK-LABEL: PR113240:
++; CHECK:       # %bb.0: # %entry
++; CHECK-NEXT:    movq %rdi, %rax
++; CHECK-NEXT:    notq %rax
++; CHECK-NEXT:    movabsq $8796093022206, %rcx # imm = 0x7FFFFFFFFFE
++; CHECK-NEXT:    notq %rcx
++; CHECK-NEXT:    orq %rax, %rcx
++; CHECK-NEXT:    andq %rdi, %rcx
++; CHECK-NEXT:    movq %rcx, 0
++; CHECK-NEXT:    retq
++entry:
++  %and = and i64 %a, 8796093022206
++  %bf.value = and i64 8796093022206, 0
++  %not = xor i64 %and, -1
++  %and4 = and i64 %a, %not
++  store i64 %and4, ptr null, align 8
++  ret void
++}
++

third_party/llvm/workspace.bzl

@@ -4,8 +4,8 @@ load("//third_party:repo.bzl", "tf_http_archive")
 
 def repo(name):
     """Imports LLVM."""
-    LLVM_COMMIT = "f58ce1152703ca753794b8cef36da30bd2668d0f"
-    LLVM_SHA256 = "cfb4610ba8b15cfe0e1ec3b6b680416983a2a5cd6883147f0fe0043c61bbcb7c"
+    LLVM_COMMIT = "6c4267fb1779bc5550bb413f33250f9365acfbc6"
+    LLVM_SHA256 = "7010ee8fe86246fabcaedbed21fa9ac2bd2542e0d2ad6172a4481e0294fdf354"
 
     tf_http_archive(
         name = name,