Bug 878818 - Include column numbers in asm.js diagnostics. r=luke
Bug 871728 - Avoid pushing the stack pointer to the stack; it's saved and restored in ABIArgGenerator::NonVolatileReg. r=luke
Bug 875917 - Use xorl to zero a register instead of movl. r=luke
Bug 875916 - Fix some x86 assembly spew bugs. Also, change the order of operands in psrlq and psllq to be consistent with the operand ordering used in the rest of the file. r=sstangl