This is primarily preparation for inlining, not an optimization by itself,
but it still helps some.

name                                       old                     new          delta
BenchmarkBinaryTree17              18.2s × (0.99,1.01)     17.9s × (0.99,1.01)  -1.57%
BenchmarkFannkuch11                4.44s × (1.00,1.00)     4.42s × (1.00,1.00)  -0.40%
BenchmarkFmtFprintfEmpty           119ns × (0.95,1.02)     118ns × (0.96,1.02)  ~
BenchmarkFmtFprintfString          501ns × (0.99,1.02)     486ns × (0.99,1.01)  -2.89%
BenchmarkFmtFprintfInt             474ns × (0.99,1.00)     457ns × (0.99,1.01)  -3.59%
BenchmarkFmtFprintfIntInt          792ns × (1.00,1.00)     768ns × (1.00,1.01)  -3.03%
BenchmarkFmtFprintfPrefixedInt     574ns × (1.00,1.01)     584ns × (0.99,1.03)  +1.83%
BenchmarkFmtFprintfFloat           749ns × (1.00,1.00)     739ns × (0.99,1.00)  -1.34%
BenchmarkFmtManyArgs              2.94µs × (1.00,1.01)    2.77µs × (1.00,1.00)  -5.76%
BenchmarkGobDecode                39.5ms × (0.99,1.01)    39.3ms × (0.99,1.01)  ~
BenchmarkGobEncode                39.4ms × (1.00,1.01)    39.4ms × (0.99,1.00)  ~
BenchmarkGzip                      658ms × (1.00,1.01)     661ms × (0.99,1.01)  ~
BenchmarkGunzip                    142ms × (1.00,1.00)     142ms × (1.00,1.00)  +0.22%
BenchmarkHTTPClientServer          134µs × (0.99,1.01)     133µs × (0.98,1.01)  ~
BenchmarkJSONEncode               57.1ms × (0.99,1.01)    56.5ms × (0.99,1.01)  ~
BenchmarkJSONDecode                141ms × (1.00,1.00)     143ms × (1.00,1.00)  +1.09%
BenchmarkMandelbrot200            6.01ms × (1.00,1.00)    6.01ms × (1.00,1.00)  ~
BenchmarkGoParse                  10.1ms × (0.91,1.09)     9.6ms × (0.94,1.07)  ~
BenchmarkRegexpMatchEasy0_32       207ns × (1.00,1.01)     210ns × (1.00,1.00)  +1.45%
BenchmarkRegexpMatchEasy0_1K       592ns × (0.99,1.00)     596ns × (0.99,1.01)  +0.68%
BenchmarkRegexpMatchEasy1_32       184ns × (0.99,1.01)     184ns × (0.99,1.01)  ~
BenchmarkRegexpMatchEasy1_1K      1.01µs × (1.00,1.00)    1.01µs × (0.99,1.01)  ~
BenchmarkRegexpMatchMedium_32      327ns × (0.99,1.00)     327ns × (1.00,1.01)  ~
BenchmarkRegexpMatchMedium_1K     92.5µs × (1.00,1.00)    93.0µs × (1.00,1.02)  +0.48%
BenchmarkRegexpMatchHard_32       4.79µs × (0.95,1.00)    4.76µs × (0.95,1.01)  ~
BenchmarkRegexpMatchHard_1K        136µs × (1.00,1.00)     136µs × (1.00,1.01)  ~
BenchmarkRevcomp                   900ms × (0.99,1.01)     892ms × (1.00,1.01)  ~
BenchmarkTemplate                  170ms × (0.99,1.01)     175ms × (0.99,1.00)  +2.95%
BenchmarkTimeParse                 645ns × (1.00,1.00)     638ns × (1.00,1.00)  -1.16%
BenchmarkTimeFormat                740ns × (1.00,1.00)     772ns × (1.00,1.00)  +4.39%

Change-Id: I0be905e32791e0cb70ff01f169c4b309a971d981
Reviewed-on: https://go-review.googlesource.com/9159Reviewed-by: Rick Hudson <rlh@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>