[clang] Fix PowerPC test failure from [AsmWriter] Change the output syntax of floating-point literals. (PR #196407)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Joshua Cranmer (jcranmer-intel)

<details>
<summary>Changes</summary>

The root cause of the failure is that the output syntax only outputs the +/-snan syntax for ppc_fp128 if the trailing double is 0. The clang test here is triggering -LDBL_SNAN, which is actually an fneg(snan constant), and the fneg causes the signs of both doubles in the ppc_fp128 to flip. As a result, only the ppc_fp128 form is output in the hexadecimal format rather than the -snan format, necessitating a change to the test output.

---
Full diff: https://github.com/llvm/llvm-project/pull/196407.diff


1 Files Affected:

- (modified) clang/test/C/C2y/n3364.c (+1-1) 


``````````diff
diff --git a/clang/test/C/C2y/n3364.c b/clang/test/C/C2y/n3364.c
index 11c2999cb9be6..1662d637da071 100644
--- a/clang/test/C/C2y/n3364.c
+++ b/clang/test/C/C2y/n3364.c
@@ -39,4 +39,4 @@ long double ld2 = +LDBL_SNAN;
 long double ld3 = -LDBL_SNAN;
 // CHECK: @ld1 = {{.*}}global {{double|x86_fp80|fp128|ppc_fp128}} +snan(
 // CHECK: @ld2 = {{.*}}global {{double|x86_fp80|fp128|ppc_fp128}} +snan(
-// CHECK: @ld3 = {{.*}}global {{double|x86_fp80|fp128|ppc_fp128}} -snan(
+// CHECK: @ld3 = {{.*}}global {{double|x86_fp80|fp128|ppc_fp128}} {{-snan\(|f0x8000000000000000FFF4000000000000}}

``````````

</details>


https://github.com/llvm/llvm-project/pull/196407