Go patch committed: Lower constant string comparisons

[Ian Lance Taylor]

This patch to the Go compiler lowers constant string comparisons at
compile time rather than runtime.  Not doing this led to a compiler
crash on code like

var V = "a" > "b"

because the compiler thinks that expressions involving only constants do
not require any runtime initialization, but string comparison requires a
function call.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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