cmd/compile: add 2 phiopt cases

cmd/compile: add 2 phiopt cases

Add 2 more cases:

if a { x = value } else { x = a } => x = a && value
if a { x = a } else { x = value } => x = a || value

AND case goes from:

00006 (8)	TESTB	AX, AX
00007 (8)	JNE	9
00008 (13)	MOVL	AX, BX
00009 (13)	MOVL	BX, AX
00010 (13)	RET

to:

00006 (13)	ANDL	BX, AX
00007 (13)	RET

OR goes from:

00006 (19)	TESTB	AX, AX
00007 (19)	JNE	9
00008 (24)	MOVL	BX, AX
00009 (24)	RET

to:

00006 (24)	ORL	BX, AX
00007 (24)	RET

compilecmp linux/amd64:

runtime
runtime.lock2 847 -> 869  (+2.60%)
runtime.addspecial 542 -> 517  (-4.61%)
runtime.tracebackPCs changed
runtime.scanstack changed
runtime.mallocinit changed
runtime.traceback2 2238 -> 2206  (-1.43%)

runtime [cmd/compile]
runtime.lock2 860 -> 882  (+2.56%)
runtime.scanstack changed
runtime.addspecial 542 -> 517  (-4.61%)
runtime.traceback2 2238 -> 2206  (-1.43%)
runtime.lockWithRank 870 -> 890  (+2.30%)
runtime.tracebackPCs changed
runtime.mallocinit changed

strconv
strconv.ryuFtoaFixed32 changed
strconv.ryuFtoaFixed64 639 -> 638  (-0.16%)
strconv.readFloat changed
strconv.ryuFtoaShortest changed

strings
strings.(*Replacer).build changed

strconv [cmd/compile]
strconv.readFloat changed
strconv.ryuFtoaFixed64 639 -> 638  (-0.16%)
strconv.ryuFtoaFixed32 changed
strconv.ryuFtoaShortest changed

strings [cmd/compile]
strings.(*Replacer).build changed

regexp
regexp.makeOnePass.func1 changed

regexp [cmd/compile]
regexp.makeOnePass.func1 changed

encoding/json
encoding/json.indirect changed

database/sql
database/sql.driverArgsConnLocked changed

vendor/golang.org/x/text/unicode/norm
vendor/golang.org/x/text/unicode/norm.Form.transform changed

go/doc/comment
go/doc/comment.parseSpans changed

internal/diff
internal/diff.tgs changed

log/slog
log/slog.(*handleState).appendNonBuiltIns 1898 -> 1877  (-1.11%)

testing/fstest
testing/fstest.(*fsTester).checkGlob changed

runtime/pprof
runtime/pprof.(*profileBuilder).build changed

cmd/internal/dwarf
cmd/internal/dwarf.isEmptyInlinedCall 254 -> 244  (-3.94%)

go/printer
go/printer.keepTypeColumn 302 -> 270  (-10.60%)
go/printer.(*printer).binaryExpr changed

cmd/compile/internal/syntax
cmd/compile/internal/syntax.(*scanner).rune changed
cmd/compile/internal/syntax.(*scanner).number 2137 -> 2153  (+0.75%)

Change-Id: I7f95f54b03a35d0b616c40f38b415a7feb71be73
Reviewed-on: https://go-review.googlesource.com/c/go/+/666835
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Jakub Ciolek <jakub@ciolek.dev>
TryBot-Bypass: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>