[llvm] [StandardInstrumentations] Support -print-after-pass-number option (PR #87458)

[Vincent Lee via llvm-commits]

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@@ -802,6 +807,8 @@ void PrintIRInstrumentation::printBeforePass(StringRef PassID, Any IR) {
       (shouldPrintBeforePass(PassID) || shouldPrintAfterPass(PassID)))
     DumpIRFilename = fetchDumpFilename(PassID, IR);
 
+  ++CurrentPassNumber;
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thevinster wrote:

Moved the `CurrentPassNumber` back to where it was to preserve the behavior of consecutive pass numbers for printing filtered IR. I also added a test for it in the same file. The new solution is to push a new PassRunDescriptor after `CurrentPassNumber` has been incremented. 

https://github.com/llvm/llvm-project/pull/87458