[CodeGen] Remove two dead pass initializer decls. NFC

- After #97727 and #101652, `LowerConstantIntrinsics` and
  `ExpandVectorPredicationPass` are no longer dedicated passes.

Author: darkbuck

llvm/include/llvm/InitializePasses.h

@@ -111,7 +111,6 @@ void initializeExpandMemCmpLegacyPassPass(PassRegistry &);
 void initializeExpandPostRAPass(PassRegistry &);
 void initializeExpandReductionsPass(PassRegistry &);
 void initializeExpandVariadicsPass(PassRegistry &);
-void initializeExpandVectorPredicationPass(PassRegistry &);
 void initializeExternalAAWrapperPassPass(PassRegistry &);
 void initializeFEntryInserterPass(PassRegistry &);
 void initializeFinalizeISelPass(PassRegistry &);
@@ -174,7 +173,6 @@ void initializeLoopStrengthReducePass(PassRegistry &);
 void initializeLoopTermFoldPass(PassRegistry &);
 void initializeLoopUnrollPass(PassRegistry &);
 void initializeLowerAtomicLegacyPassPass(PassRegistry &);
-void initializeLowerConstantIntrinsicsPass(PassRegistry &);
 void initializeLowerEmuTLSPass(PassRegistry &);
 void initializeLowerGlobalDtorsLegacyPassPass(PassRegistry &);
 void initializeLowerIntrinsicsPass(PassRegistry &);