94f56408db
Change the compiler handle append as the gc compiler does: call a
function to grow the slice, but otherwise assign the new elements
directly to the final slice.
For the current gccgo memory allocator the slice code has to call
runtime_newarray, not mallocgc directly, so that the allocator sets the
TypeInfo_Array bit in the type pointer.
Rename the static function cnew to runtime_docnew, so that the stack
trace ignores it when ignoring runtime functions. This was needed to
fix the runtime/pprof tests on 386.
Reviewed-on: https://go-review.googlesource.com/32218
From-SVN: r241667
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