8384095: [ppc64] assert(is_MachTemp() || res->isa_ptr() == nullptr) failed: must not be a pointer

[TheRealMDoerr]

The bottom_type is computed differently since JDK-8379667. Now, MachNode::bottom_type() uses _opnds[0]->type() which is incorrect for TOC related nodes which use iRegPdstOper() for non-oop values. Note that postalloc expand nodes only exist for PPC64.

I can still see GC issues. May be a separate issue.

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Issue

• JDK-8384095: [ppc64] assert(is_MachTemp() || res->isa_ptr() == nullptr) failed: must not be a pointer (Bug - P1)

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