I ran into an assertion failure at assembler_sparc.hpp:887 when testing my
changes for 6178789. The assertion is:

# Error: assert(inv_wdisp( r, off, nbits ) == x,"inverse not inverse")

It turns out gen_c2i_adapter() in sharedRuntime_sparc.cpp incorrectly tests
for LP64. For 64bit build, _LP64 is defined, not LP64.

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