[lldb] Add armv7a and armv8a ArchSpecs (llvm#106433)

armv7a and armv8a are common names for the application subarch for arm.

These names in particular are used in ChromeOS, Android, and a few other
known applications. In ChromeOS, we encountered a bug where armv7a arch
was not recognised and segfaulted when starting an executable on an
arm32 device.

Google Issue Tracker:
https://issuetracker.google.com/361414339

lldb/include/lldb/Utility/ArchSpec.h

@@ -123,6 +123,7 @@ class ArchSpec {
     eCore_arm_armv6,
     eCore_arm_armv6m,
     eCore_arm_armv7,
+    eCore_arm_armv7a,
     eCore_arm_armv7l,
     eCore_arm_armv7f,
     eCore_arm_armv7s,
@@ -145,6 +146,7 @@ class ArchSpec {
     eCore_thumbv7em,
     eCore_arm_arm64,
     eCore_arm_armv8,
+    eCore_arm_armv8a,
     eCore_arm_armv8l,
     eCore_arm_arm64e,
     eCore_arm_arm64_32,

lldb/source/Utility/ArchSpec.cpp

@@ -60,6 +60,8 @@ static const CoreDefinition g_core_definitions[] = {
      "armv6m"},
     {eByteOrderLittle, 4, 2, 4, llvm::Triple::arm, ArchSpec::eCore_arm_armv7,
      "armv7"},
+    {eByteOrderLittle, 4, 2, 4, llvm::Triple::arm, ArchSpec::eCore_arm_armv7a,
+     "armv7a"},
     {eByteOrderLittle, 4, 2, 4, llvm::Triple::arm, ArchSpec::eCore_arm_armv7l,
      "armv7l"},
     {eByteOrderLittle, 4, 2, 4, llvm::Triple::arm, ArchSpec::eCore_arm_armv7f,
@@ -102,6 +104,8 @@ static const CoreDefinition g_core_definitions[] = {
      ArchSpec::eCore_arm_arm64, "arm64"},
     {eByteOrderLittle, 8, 4, 4, llvm::Triple::aarch64,
      ArchSpec::eCore_arm_armv8, "armv8"},
+    {eByteOrderLittle, 8, 4, 4, llvm::Triple::aarch64,
+     ArchSpec::eCore_arm_armv8a, "armv8a"},
     {eByteOrderLittle, 4, 2, 4, llvm::Triple::arm, ArchSpec::eCore_arm_armv8l,
      "armv8l"},
     {eByteOrderLittle, 8, 4, 4, llvm::Triple::aarch64,