[LLVM] Fix missing includes for function declarations that will be needed for explicit symbol visibility (#103900)

In multiple source files function definitions never sees there
declaration in a header because its never included causing linker errors
when explicit symbol visibility macros\dllexport are added to the
declarations.

Most of these were originally found by @tstellar in
https://github.com/llvm/llvm-project/pull/67502

TargetRegistry.h is needed in MCExternalSymbolizer.cpp for
createMCSymbolizer
Analysis/Passes.h is needed in LazyValueInfo.cpp and RegionInfo.cpp for
createLazyValueInfoPassin and createRegionInfoPass
Transforms/Scalar.h is needed in SpeculativeExecution.cpp for
createSpeculativeExecutionPass

llvm/lib/Analysis/LazyValueInfo.cpp

@@ -17,6 +17,7 @@
 #include "llvm/Analysis/AssumptionCache.h"
 #include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/InstructionSimplify.h"
+#include "llvm/Analysis/Passes.h"
 #include "llvm/Analysis/TargetLibraryInfo.h"
 #include "llvm/Analysis/ValueLattice.h"
 #include "llvm/Analysis/ValueTracking.h"

llvm/lib/Analysis/RegionInfo.cpp

@@ -15,6 +15,7 @@
 #ifndef NDEBUG
 #include "llvm/Analysis/RegionPrinter.h"
 #endif
+#include "llvm/Analysis/Passes.h"
 #include "llvm/Analysis/RegionInfoImpl.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/IR/Function.h"

llvm/lib/MC/MCDisassembler/MCExternalSymbolizer.cpp

@@ -10,6 +10,7 @@
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
 #include "llvm/MC/MCInst.h"
+#include "llvm/MC/TargetRegistry.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstring>
 

llvm/lib/Transforms/Scalar/SpeculativeExecution.cpp

@@ -71,6 +71,7 @@
 #include "llvm/InitializePasses.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Transforms/Scalar.h"
 
 using namespace llvm;