[compiler-rt] [compiler-rt][cmake] Test COMPILER_RT_HAS_AARCH64_SME with arm64 (PR #141115)

[Amara Emerson via llvm-commits]

================
@@ -41,14 +41,14 @@ asm(\".arch armv8-a+lse\");
 asm(\"cas w0, w1, [x2]\");
 ")
 
-builtin_check_c_compiler_source(COMPILER_RT_HAS_AARCH64_SME
+builtin_check_c_compiler_source_with_flags(COMPILER_RT_HAS_AARCH64_SME
 "
 void foo(void)  __arm_streaming_compatible {
   asm(\".arch armv9-a+sme2\\n\"
       \"smstart\\n\"
       \"ldr zt0, [sp]\");
 }
-")
+" "-target aarch64-linux-gnu")
----------------
aemerson wrote:

Ok, that's not what I thought it meant. @petrhosek your slides at https://llvm.org/devmtg/2023-10/slides/tutorials/Hosek-UnderstandingtheLLVMbuild.pdf on slide 18 indicate that `RUNTIMES` mean using the just-built compiler. Is that not strictly true?

https://github.com/llvm/llvm-project/pull/141115