[SOL] Create SBF sub architectures (#136)

Merge remote-tracking branch 'upstream/release/19.x' into rustc/19.1-…

Merge remote-tracking branch 'upstream/release/19.x' into rustc/19.1-…

[SOL] Remove expand in order option (#135)

[SOL] Fine tune memory operations threshold (#134)

[SOL] Use the value size for lowering arguments

[SOL] Remove atomic_load_sub from SBF (#132)

[SOL] Correctly disassemble store imm (#131)

[SOL] Add local symbols to dynamic symbol table (#130)

[SOL] Define page and base sizes for SBF (#129)

[SOL] Add return instructions for functions that end with unreachable (…

Debug extra symbols

[SOL] Expand mulh for 32-bit (#127)

[SOL] Remove unused function (#125)

[SOL] Remove +solana flag from clang (#123)

[SOL] Split features into SBF versions (#124)

[SOL] Simplify code emission for syscalls (#122)

[SOL] Implement syscall instruction (#121)

Implement return instruction (#120)

[SOL] New encoding for memory instructions (#118)

[SOL] Revamp peephole pass for explicit sign extension (#119)

[SOL] Use R10 as the stack pointer (#117)

[SOL] Fix ALU32 instructions with explicit sign extension (#116)

[SOL] Create explicit sign extension instruction (#114)

[SOL] Implement store imm instructions (#115)

[SOL] Remove isSolana flag (#113)

Allow instruction combine (#112)