[llvm] [InstrProf] Do not emit metadata for zero values with zero counts (PR #199380)

[Snehasish Kumar via llvm-commits]

================
@@ -0,0 +1,16 @@
+:ir
+test_call
+# Func Hash:
+170957022131388415
+# Num Counters:
+1
+# Counter Values:
+130
+# Num Value Kinds:
+1
+# ValueKind = IPVK_IndirectCallTarget:
+0
+# NumValueSites:
+1
+1
+** External Symbol **:0
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snehasish wrote:

Is the '**' format valid prof text?

https://github.com/llvm/llvm-project/pull/199380