[clang] [clang] Lower non-builtin sincos[f|l] calls to llvm.sincos.* when -fno-math-errno is set (PR #121763)

[Matt Arsenault via cfe-commits]

================
@@ -1,5 +1,19 @@
-// RUN: %clang_cc1 -triple=aarch64-gnu-linux -emit-llvm -O1 %s -o - | FileCheck --check-prefix=NO-MATH-ERRNO %s
-// RUN: %clang_cc1 -triple=aarch64-gnu-linux -emit-llvm -fmath-errno %s -o - | FileCheck --check-prefix=MATH-ERRNO %s
+// RUN: %clang_cc1 -triple=aarch64-gnu-linux -emit-llvm -O1 %s -o - -DUSE_BUILTIN | FileCheck --check-prefix=NO-MATH-ERRNO %s
+// RUN: %clang_cc1 -triple=aarch64-gnu-linux -emit-llvm -fmath-errno %s -o - -DUSE_BUILTIN | FileCheck --check-prefix=MATH-ERRNO %s
+// RUN: %clang_cc1 -triple=aarch64-gnu-linux -emit-llvm -O1 %s -o - -DUSE_C_DECL | FileCheck --check-prefix=NO-MATH-ERRNO %s
+// RUN: %clang_cc1 -triple=aarch64-gnu-linux -emit-llvm -fmath-errno %s -o - -DUSE_C_DECL | FileCheck --check-prefix=MATH-ERRNO %s
+
+#if defined(USE_BUILTIN)
----------------
arsenm wrote:

Can you just duplicate the test functions into builtin and non-builtin forms? This is much harder to follow 

https://github.com/llvm/llvm-project/pull/121763