Compiling x86 code

[Jeff Epler]

These flags are documented as controlling the use of push instructions on x86 and x86_64 targets:

'-mpush-args'
'-mno-push-args'
     Use PUSH operations to store outgoing parameters.  This method is
     shorter and usually equally fast as method using SUB/MOV operations
     and is enabled by default.  In some cases disabling it may improve
     performance because of improved scheduling and reduced
     dependencies.

Jeff