[llvm] [RISCV] Make parseNormalizedArchString only accept [a-z0-9_]. (PR #90815)

[Brandon Wu via llvm-commits]

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@@ -21,10 +21,11 @@ bool operator==(const RISCVISAUtils::ExtensionVersion &A,
 }
 
 TEST(ParseNormalizedArchString, RejectsUpperCase) {
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4vtomat wrote:

Need to change the test name.

https://github.com/llvm/llvm-project/pull/90815