6696264: assert("narrow oop can never be zero") for GCBasher & ParNewGC
Summary: decouple set_klass() with zeroing the gap when compressed.
Reviewed-by: kvn, ysr, jrose
/*
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// machine-dependent parts of class relocInfo
private:
enum {
// Intel instructions are byte-aligned.
offset_unit = 1,
// Encodes Assembler::disp32_operand vs. Assembler::imm32_operand.
#ifndef AMD64
format_width = 1
#else
// vs Assembler::narrow_oop_operand.
format_width = 2
#endif
};