[cfe-commits] Mips inline constraint register patch. Request for review and commit.

[Carter, Jack]

Mips_reg_constraint.patch

Contributor: Jack Carter

Inline asm directives have constraint characters that describe what is legal
for the particular operand. Some of these constraints state that the operand
is a register, specific or general.

This patch adds 3 different characters to the list of characters that represents
registers:

    'c': A register suitable for use in an indirect jump.
    'l': The lo register.
    'x': The concatenated hi and lo registers.

This patch does not address the semantic behavior.
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