fix sh/fdpic issues found after first submission upstream
the following issues are fixed: - ICE generating the new libgcc __ashlsi3_r0 and __lshrsi3_r0 shift operations for non-J2 SH2. - new sh_legitimate_constant_p function was unused because there was an existing version with different signature which C++ allowed to be overloaded rather than reporting the error. - reversed asm spec conditional for fdpic broke non-fdpic builds. this commit rebases the patch against gcc trunk and backports the result. file order has been tweaked by hand so that the diff is friendly to manual inspection.
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