asm: Add asm_emit_jcc_rel macros for Rel version of EmitJcc
asm: Fix opcode and function name

The correct name is push.adr, not push.addr, and the opcode constant
is actually called OP_PUSH_ADR, with a single D, so the function would
not compile anyway.
asm: Fix missing tag
asm: Add AsmEmitBreak()