Reapply "[NFC][DebugInfo][DWARF] Create new low-level dwarf library (#… (#145959) (#146112)

Reapply "[NFC][DebugInfo][DWARF] Create new low-level dwarf library (#…
(#145959)
    
This reapplies cbf781f0bd, with fixes for
the shared-library build and the unconventional sanitizer-runtime build.

Original Description:

This is the culmination of a series of changes described in [1].
    
Although somewhat large by line count, it is almost entirely mechanical,
creating a new library in DebugInfo/DWARF/LowLevel. This new library has
very minimal dependencies, allowing it to be used from more places than
the normal DebugInfo/DWARF library--in particular from MC.
    
1.
https://discourse.llvm.org/t/rfc-debuginfo-dwarf-refactor-into-to-lower-and-higher-level-libraries/86665/2

utils/bazel/llvm-project-overlay/bolt/BUILD.bazel

@@ -106,6 +106,7 @@ cc_library(
         "//llvm:DWARFLinker",
         "//llvm:DWP",
         "//llvm:DebugInfoDWARF",
+        "//llvm:DebugInfoDWARFLowLevel",
         "//llvm:Demangle",
         "//llvm:JITLink",
         "//llvm:MC",
@@ -296,6 +297,7 @@ cc_library(
         "//llvm:BinaryFormat",
         "//llvm:CodeGen",
         "//llvm:DebugInfoDWARF",
+        "//llvm:DebugInfoDWARFLowLevel",
         "//llvm:Demangle",
         "//llvm:ExecutionEngine",
         "//llvm:MC",

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

@@ -493,6 +493,7 @@ cc_library(
         ":DebugInfo",
         ":DebugInfoCodeView",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":DebugInfoPDB",
         ":Demangle",
         ":MC",
@@ -572,6 +573,7 @@ cc_library(
     deps = [
         ":BinaryFormat",
         ":DebugInfo",
+        ":DebugInfoDWARFLowLevel",
         ":MC",
         ":Object",
         ":Support",
@@ -579,6 +581,20 @@ cc_library(
     ],
 )
 
+cc_library(
+    name = "DebugInfoDWARFLowLevel",
+    srcs = glob([
+        "lib/DebugInfo/DWARF/LowLevel/*.cpp",
+    ]),
+    hdrs = glob(["include/llvm/DebugInfo/DWARF/LowLevel/*.h"]),
+    copts = llvm_copts,
+    deps = [
+        ":BinaryFormat",
+        ":Support",
+        ":TargetParser",
+    ],
+)
+
 cc_library(
     name = "DebugInfoGSYM",
     srcs = glob([
@@ -1163,6 +1179,7 @@ cc_library(
         ":Core",
         ":DebugInfo",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":Demangle",
         ":Object",
         ":Support",
@@ -2090,6 +2107,7 @@ cc_library(
         ":Core",
         ":DebugInfoCodeView",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":IPO",
         ":IRPrinter",
         ":Instrumentation",
@@ -3231,6 +3249,7 @@ cc_library(
         ":CodeGenTypes",
         ":DWARFLinkerBase",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":MC",
         ":Support",
         ":Target",
@@ -3249,6 +3268,7 @@ cc_library(
         ":BinaryFormat",
         ":CodeGen",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":Support",
         ":Target",
     ],
@@ -3549,6 +3569,7 @@ cc_library(
         ":DWARFLinkerParallel",
         ":DebugInfo",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":DsymutilTableGen",
         ":MC",
         ":Object",
@@ -3966,6 +3987,7 @@ cc_binary(
         ":BinaryFormat",
         ":DebugInfo",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":MC",
         ":Object",
         ":Support",
@@ -3997,6 +4019,7 @@ cc_binary(
         ":DWARFLinker",
         ":DWARFLinkerParallel",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":DwarfutilOptionsTableGen",
         ":MC",
         ":ObjCopy",
@@ -4614,6 +4637,7 @@ cc_library(
         ":DebugInfo",
         ":DebugInfoBTF",
         ":DebugInfoDWARF",
+        ":DebugInfoDWARFLowLevel",
         ":Debuginfod",
         ":Demangle",
         ":MC",