12474 Provide CFI for amd64 _start

Review Request #2533 - Created April 5, 2020 and updated

Information
Jason King
illumos-gate
Reviewers
general

Adds the CFI directives to generate .eh_frame and .eh_frame_hdr for AMD64 crt1.o

Several libunwind tests fail without this by not correctly terminating a stack walk. With this fix, they correctly stop walking the stack at _start.

Igor Kozhukhov
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