[clang] [RISCV][FMV] Remove support for negative priority (PR #112161)

[Craig Topper via cfe-commits]

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@@ -2909,18 +2909,16 @@ static int getPriorityFromAttrString(StringRef AttrStr) {
   AttrStr.split(Attrs, ';');
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topperc wrote:

Should the function return `unsigned` instead of `int` now?

https://github.com/llvm/llvm-project/pull/112161