[mips][mips64r6] Test that branch likelies are not accepted on MIPS64r6.

[dsanders]

Summary

They aren't implemented for any ISA at the moment.

Depends on D3670

[vmedic]

LGTM

lib/Target/Mips/Mips32r6InstrInfo.td

 // Reencoded: sdbbp
 // Reencoded: sdc2
 // Reencoded: swc2
 // Removed: /.ps$/, cvt.ps.s, cvt.ps.pw
 // Removed: addi
 // Removed: bc1any2, bc1any4
 // Removed: bc2[ft]
 // Removed: bc2f, bc2t
-// Removed: bc[12][ft]l, bgezl, bgtzl, bgtzl, blezl, bltzall, bltzl, bnel, bgezall,
-// Removed: beql
 // Removed: bgezal
 // Removed: bltzal
 // Removed: c.cond.fmt, bc1[ft]
 // Removed: div, divu
 // Removed: jalx
 // Removed: ldxc1
 // Removed: luxc1
 // Removed: lwl, lwr, lwle, lwre, swl, swr, swle, swre

test/MC/Mips/mips32r6/invalid-mips2-wrong-error.s

+# Instructions that are invalid and are correctly rejected but use the wrong
+# error message at the moment.
+#
+# RUN: not llvm-mc %s -triple=mips-unknown-linux -show-encoding -mcpu=mips32r6 \
+# RUN:     2>%t1
+# RUN: FileCheck %s < %t1
+
+        .set noat
+        beql $1,$2,4            # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bgezall $3,8            # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bgezl $3,8              # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bgtzl $4,16             # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        blezl $3,8              # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bltzall $3,8            # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bltzl $4,16             # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bnel $1,$2,4            # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc1tl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc1fl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc2tl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc2fl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction

test/MC/Mips/mips32r6/invalid-mips32-wrong-error.s

+# Instructions that are invalid and are correctly rejected but use the wrong
+# error message at the moment.
+#
+# RUN: not llvm-mc %s -triple=mips-unknown-linux -show-encoding -mcpu=mips32r6 \
+# RUN:     2>%t1
+# RUN: FileCheck %s < %t1
+
+        .set noat
+        bc1tl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc1tl $fcc1,4           # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc1fl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc1fl $fcc1,4           # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc2tl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc2tl $fcc1,4           # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc2fl 4                 # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction
+        bc2fl $fcc1,4           # CHECK: :[[@LINE]]:{{[0-9]+}}: error: Unknown instruction