Delete IA64-specific comment and associated code

[jkotas]

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[Copilot]

Pull Request Overview

This PR refactors the jump instruction emission and decoding functions across multiple architectures (amd64, i386, arm, arm64, riscv64, loongarch64, wasm) to eliminate intermediate wrapper functions and consolidate the codebase. The changes rename emitJump and decodeJump to emitBackToBackJump and decodeBackToBackJump directly, removing the historical wrapper layer that was originally designed for IA64 architecture considerations.

Key changes:

• Consolidated emitJump/decodeJump and emitBackToBackJump/decodeBackToBackJump into single implementations
• Removed obsolete IA64-specific comments about back-to-back jump optimization requirements
• Removed unused GetAnyThunkTarget stub implementations from ARM64, RISCV64, and LoongArch64 architectures

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/coreclr/vm/amd64/cgenamd64.cpp	Consolidated isJumpRel32, isJumpRel64, decodeJump32, decodeJump64 into unified isBackToBackJump and decodeBackToBackJump; renamed emitJump to emitBackToBackJump; removed obsolete comment
src/coreclr/vm/amd64/cgencpu.h	Updated function declarations to use consolidated emitBackToBackJump, isBackToBackJump, and decodeBackToBackJump; removed inline wrapper implementations
src/coreclr/vm/i386/cgencpu.h	Renamed emitJump to emitBackToBackJump and decodeJump to decodeBackToBackJump; removed wrapper implementations and obsolete IA64 comment
src/coreclr/vm/arm/cgencpu.h	Renamed emitJump to emitBackToBackJump and decodeJump to decodeBackToBackJump; removed wrapper implementations and obsolete IA64 comment
src/coreclr/vm/arm64/cgencpu.h	Renamed emitJump to emitBackToBackJump and decodeJump to decodeBackToBackJump; removed wrapper implementations
src/coreclr/vm/arm64/stubs.cpp	Removed unused GetAnyThunkTarget stub implementation
src/coreclr/vm/riscv64/cgencpu.h	Renamed emitJump to emitBackToBackJump and decodeJump to decodeBackToBackJump; removed wrapper implementations
src/coreclr/vm/riscv64/stubs.cpp	Removed unused GetAnyThunkTarget stub implementation
src/coreclr/vm/loongarch64/cgencpu.h	Renamed emitJump to emitBackToBackJump and decodeJump to decodeBackToBackJump; removed wrapper implementations
src/coreclr/vm/loongarch64/stubs.cpp	Removed unused GetAnyThunkTarget stub implementation
src/coreclr/vm/wasm/cgencpu.h	Removed obsolete IA64-specific comment about back-to-back jump optimization
src/coreclr/vm/precode.h	Updated call sites to use isBackToBackJump and decodeBackToBackJump
src/coreclr/vm/dynamicmethod.cpp	Updated call site to use emitBackToBackJump
src/coreclr/vm/codeman.cpp	Updated call site to use emitBackToBackJump

Comments suppressed due to low confidence (1)

src/coreclr/vm/amd64/cgenamd64.cpp:496

• The comment references 'emitJump' but this function has been renamed to 'emitBackToBackJump'. Update the comment to: // emitBackToBackJump may throw

        THROWS; // emitBackToBackJump may throw (see emitJump)

[jkotas]

/ba-g infrastructure timeouts