[CIR] Backport clang commit to unxfail some builtin call (llvm#1501)

Ref:
llvm@cd269fe

Related: llvm#1497

Author: FantasqueX

clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp

@@ -2772,8 +2772,10 @@ cir::FuncOp CIRGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
                                                 unsigned BuiltinID) {
   assert(astContext.BuiltinInfo.isLibFunction(BuiltinID));
 
-  // Get the name, skip over the __builtin_ prefix (if necessary).
-  StringRef Name;
+  // Get the name, skip over the __builtin_ prefix (if necessary). We may have
+  // to build this up so provide a small stack buffer to handle the vast
+  // majority of names.
+  llvm::SmallString<64> Name;
   GlobalDecl D(FD);
 
   // TODO: This list should be expanded or refactored after all GCC-compatible
@@ -2832,7 +2834,7 @@ cir::FuncOp CIRGenModule::getBuiltinLibFunction(const FunctionDecl *FD,
                  AIXLongDouble64Builtins.end())
       Name = AIXLongDouble64Builtins[BuiltinID];
     else
-      Name = StringRef(astContext.BuiltinInfo.getName(BuiltinID).data(), 10);
+      Name = astContext.BuiltinInfo.getName(BuiltinID).substr(10);
   }
 
   auto Ty = convertType(FD->getType());

clang/lib/CIR/CodeGen/CIRGenModule.cpp

@@ -3695,7 +3695,8 @@ struct FunctionIsDirectlyRecursive
     unsigned builtinId = func->getBuiltinID();
     if (!builtinId || !builtinCtx.isLibFunction(builtinId))
       return false;
-    StringRef builtinName = builtinCtx.getName(builtinId);
+    std::string builtinNameStr = builtinCtx.getName(builtinId);
+    StringRef builtinName = builtinNameStr;
     return builtinName.starts_with("__builtin_") &&
            name == builtinName.slice(strlen("__builtin_"), StringRef::npos);
   }

clang/test/CIR/CodeGen/builtins-memory.c

@@ -3,7 +3,6 @@
 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-llvm %s -o - \
 // RUN:  | opt -S -passes=instcombine,mem2reg,simplifycfg -o %t.ll 
 // RUN: FileCheck  --check-prefix=LLVM --input-file=%t.ll %s
-// XFAIL: *
 
 typedef __SIZE_TYPE__ size_t;
 void test_memcpy_chk(void *dest, const void *src, size_t n) {

clang/test/CIR/CodeGen/builtins.cpp

@@ -4,7 +4,6 @@
 // RUN:  -emit-llvm -fno-clangir-call-conv-lowering -o - %s \
 // RUN:  | opt -S -passes=instcombine,mem2reg,simplifycfg -o %t.ll 
 // RUN: FileCheck  --check-prefix=LLVM --input-file=%t.ll %s
-// XFAIL: *
 
 // This test file is a collection of test cases for all target-independent
 // builtins that are related to memory operations.

clang/test/CIR/CodeGen/libcall.cpp

@@ -1,6 +1,5 @@
 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -fclangir -mconstructor-aliases -emit-cir %s -o %t.cir
 // RUN: FileCheck --input-file=%t.cir %s
-// XFAIL: *
 
 typedef __builtin_va_list va_list;
 

clang/test/CIR/Lowering/builtin-binary-fp2fp.c

@@ -2,7 +2,6 @@
 // RUN: FileCheck --input-file=%t.ll %s -check-prefix=LLVM
 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -ffast-math -fclangir -emit-llvm %s -o %t.ll
 // RUN: FileCheck --input-file=%t.ll %s -check-prefix=LLVM-FASTMATH
-// XFAIL: *
 
 // copysign