[llvm][AArch64] Accept armv8.8 "hbc" and "mops" in .arch_extension directive

[DavidSpickett]

This isn't an exhaustive cross check of the list here and the target parser, just checked the latest few. sme has its own test file for this.

Did not add pmuv3 because as I understand it, removing that feature does not remove the PMU related register from the assembler. It only effects codegen that would use it.

[lenary]

This is looking good. Do we also need a test in llvm/test/MC/AArch64/directive-arch_extension-negative.s too?

[DavidSpickett]

Add negative tests in directive-arch_extension-negative.s.

llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp

const FeatureBitset Features;
     {"ls64", {AArch64::FeatureLS64}},
     {"xs", {AArch64::FeatureXS}},
     {"pauth", {AArch64::FeaturePAuth}},
     {"flagm", {AArch64::FeatureFlagM}},
     {"rme", {AArch64::FeatureRME}},
     {"sme", {AArch64::FeatureSME}},
     {"sme-f64", {AArch64::FeatureSMEF64}},
     {"sme-i64", {AArch64::FeatureSMEI64}},
+    {"hbc", {AArch64::FeatureHBC}},
+    {"mops", {AArch64::FeatureMOPS}},
     // FIXME: Unsupported extensions
     {"lor", {}},
     {"rdma", {}},
     {"profile", {}},
 };
 
 static void setRequiredFeatureString(FeatureBitset FBS, std::string &Str) {
   if (FBS[AArch64::HasV8_0aOps])

llvm/test/MC/AArch64/directive-arch_extension-negative.s

 // RUN: not llvm-mc -triple aarch64 \
-// RUN: -mattr=+crc,+sm4,+sha3,+sha2,+aes,+fp,+neon,+ras,+lse,+predres,+ccdp,+mte,+tlb-rmi,+pan-rwv,+ccpp,+rcpc,+ls64,+flagm \
+// RUN: -mattr=+crc,+sm4,+sha3,+sha2,+aes,+fp,+neon,+ras,+lse,+predres,+ccdp,+mte,+tlb-rmi,+pan-rwv,+ccpp,+rcpc,+ls64,+flagm,+hbc,+mops \
 // RUN: -filetype asm -o - %s 2>&1 | FileCheck %s
 
 .arch_extension axp64
 // CHECK: error: unknown architectural extension: axp64
 // CHECK-NEXT: .arch_extension axp64
 
 crc32cx w0, w1, x3
 // CHECK-NOT: [[@LINE-1]]:1: error: instruction requires: crc

 // CHECK-NEXT: ld64b x0, [x13]
 
 cfinv
 // CHECK-NOT: [[@LINE-1]]:1: error: instruction requires: flagm
 .arch_extension noflagm
 cfinv
 // CHECK: [[@LINE-1]]:1: error: instruction requires: flagm
 // CHECK-NEXT: cfinv
+
+lbl:
+bc.eq lbl
+// CHECK-NOT: [[@LINE-1]]:1: error: instruction requires: hbc
+.arch_extension nohbc
+bc.eq lbl
+// CHECK: [[@LINE-1]]:1: error: instruction requires: hbc
+// CHECK-NEXT: bc.eq lbl
+
+cpyfp [x0]!, [x1]!, x2!
+// CHECK-NOT: [[@LINE-1]]:1: error: instruction requires: mops
+.arch_extension nomops
+cpyfp [x0]!, [x1]!, x2!
+// CHECK: [[@LINE-1]]:1: error: instruction requires: mops
+// CHECK-NEXT: cpyfp [x0]!, [x1]!, x2!

llvm/test/MC/AArch64/directive-arch_extension.s

 
 .arch_extension pauth
 paciasp
 // CHECK: paciasp
 
 .arch_extension flagm
 cfinv
 // CHECK: cfinv
+
+.arch_extension hbc
+lbl:
+    bc.eq lbl
+// CHECK: bc.eq lbl
+
+.arch_extension mops
+cpyfp [x0]!, [x1]!, x2!
+// CHECK: cpyfp [x0]!, [x1]!, x2!