Go patch committed: Rewrite handling of untyped constants

[Ian Lance Taylor]

This patch to the Go frontend rewrites the handling of untyped
constants.  This fixes various bugs when, e.g., using float or complex
constants in an integer context.  It unifies the code, and removes some
400 lines from the compiler.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline and 4.7 branch.

Ian

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