Fixes LLVM 13/14 compatibility (#1395)

Fixes LLVM 13 and LLVM 14 compatibility as of the current master branch.

* LLVM 13 -- llvm::MCContext now requires the TargetTriple ; https://reviews.llvm.org/D101462
* LLVM 13 -- FPImm has been split into two functions, DFPImm retains original semantics ; https://reviews.llvm.org/D77384
* LLVM 14 -- Support/TargetRegistry.h has been moved to MC/TargetRegistry.h ; https://reviews.llvm.org/D111454

lib/bap_llvm/llvm_disasm.cpp

@@ -5,14 +5,19 @@
 #include <llvm/MC/MCRegisterInfo.h>
 #include <llvm/Support/DataTypes.h>
 #include <llvm/Support/FormattedStream.h>
-#include <llvm/Support/TargetRegistry.h>
 #include <llvm/Support/CommandLine.h>
 #if LLVM_VERSION_MAJOR >= 12
 #include <llvm/Support/Process.h>
 #include <llvm/Support/StringSaver.h>
 #endif
 #include <llvm-c/Target.h>
 
+#if LLVM_VERSION_MAJOR >= 14
+#include <llvm/MC/TargetRegistry.h>
+#else
+#include <llvm/Support/TargetRegistry.h>
+#endif
+
 #if LLVM_VERSION_MAJOR >= 10
 #include "llvm/MC/MCTargetOptions.h"
 #endif
@@ -258,8 +263,11 @@ class llvm_disassembler : public disassembler_interface {
         }
 
         shared_ptr<llvm::MCContext> ctx
+#if LLVM_VERSION_MAJOR >= 13
+            (new llvm::MCContext(t, &*asm_info, &*reg_info, 0));
+#else
             (new llvm::MCContext(&*asm_info, &*reg_info, 0));
-
+#endif
         if (!ctx) {
             if (debug_level > 0)
                 output_error(triple, cpu, "failed to create disassembly context");
@@ -522,11 +530,19 @@ class llvm_disassembler : public disassembler_interface {
             op.imm_val = mcop.getImm();
             return op;
         }
+#if LLVM_VERSION_MAJOR >= 13
+        if (mcop.isDFPImm()) {
+            op.type = bap_disasm_op_fmm;
+            op.fmm_val = bit_cast<double>(mcop.getDFPImm());
+            return op;
+        } 
+#else
         if (mcop.isFPImm()) {
             op.type = bap_disasm_op_fmm;
             op.fmm_val = mcop.getFPImm();
             return op;
         }
+#endif
         if (mcop.isInst()) {
             std::cerr << "got subinst\n";
             abort();