[llvm] [Utils][update_mc_test_checks] Handle double quotes in asm source (PR #175161)

[Jay Foad via llvm-commits]

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@@ -1,3 +1,5 @@
 // RUN: llvm-mc -triple=amdgcn -show-encoding %s 2>&1 | FileCheck --check-prefixes=CHECK %s
 
 v_bfrev_b32 v5, v1
+
+ds_swizzle_b32 v8, v2 offset:swizzle(BITMASK_PERM, "01pip")
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jayfoad wrote:

Example instruction comes from `test/MC/AMDGPU/ds.s`.

https://github.com/llvm/llvm-project/pull/175161