[llvm] [CodeGen][NPM] Port MachineBlockPlacement to NPM (PR #129828)

[Matt Arsenault via llvm-commits]

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@@ -192,6 +192,20 @@ MACHINE_FUNCTION_PASS("verify<machine-trace-metrics>", MachineTraceMetricsVerifi
 #define MACHINE_FUNCTION_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER,    \
                                           PARAMS)
 #endif
+
+MACHINE_FUNCTION_PASS_WITH_PARAMS(
+    "block-placement", "MachineBlockPlacementPass",
+    [](bool NoTailMerge) {
+      // Tail merging is enabled by default, so this option
+      // is to disable it.
+      return MachineBlockPlacementPass(!NoTailMerge);
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arsenm wrote:

This inversion of the flag is confusion, it should be consistently one way or another 

https://github.com/llvm/llvm-project/pull/129828