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

[Matt Arsenault via llvm-commits]

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@@ -192,6 +192,15 @@ 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 AllowTailMerge) {
+      // Default is true.
+      return MachineBlockPlacementPass(AllowTailMerge);
+    },
+    parseMachineBlockPlacementPassOptions, "no-tail-merge;enable-tail-merge")
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arsenm wrote:

Doesn't follow no-<positive> pattern, also not sure what this parameter list does 

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