[llvm-exegesis] Follow up of #127564: fix test. NFC. (#130072)

We don't need to run llvm-exegesis for the regression tests, just dump
the object code, so this adds option
--benchmark-phase=assemble-measured-code to achieve that.

Author: sjoerdmeijer

llvm/test/tools/llvm-exegesis/AArch64/setReg_init_check.s

@@ -3,7 +3,7 @@ REQUIRES: aarch64-registered-target
 ## PPR Register Class Initialization Testcase
 ## Ideally, we should use PTRUE_{B/H/S/D} instead of FADDV_VPZ_D for an isolated test case; 
 ## However, exegesis does not yet support PTRUE_{B/H/S/D}.
-RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FADDV_VPZ_D 2>&1 
+RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FADDV_VPZ_D --benchmark-phase=assemble-measured-code 2>&1
 RUN: llvm-objdump -d %d > %t.s
 RUN: FileCheck %s --check-prefix=PPR_ASM < %t.s
 PPR_ASM:            <foo>:
@@ -14,7 +14,7 @@ PPR_ASM-NEXT:       faddv d{{[0-9]+}}, p{{[0-9]+}}, z{{[0-9]+}}
 ## ZPR Register Class Initialization Testcase
 ## Ideally, we should use DUP_ZI_{B/H/S/D} instead of FADDV_VPZ_D for an isolated test case; 
 ## However, exegesis does not yet support DUP_ZI_{B/H/S/D}.
-RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FADDV_VPZ_D 2>&1 
+RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FADDV_VPZ_D --benchmark-phase=assemble-measured-code 2>&1
 RUN: llvm-objdump -d %d > %t.s
 RUN: FileCheck %s --check-prefix=ZPR_ASM < %t.s
 ZPR_ASM:            <foo>:
@@ -23,15 +23,15 @@ ZPR_ASM-NEXT:       mov z{{[0-9]+}}.d, #0x0
 ZPR_ASM-NEXT:       faddv d{{[0-9]+}}, p{{[0-9]+}}, z{{[0-9]+}}
 
 ## FPR128 Register Class Initialization Testcase
-RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=ADDVv16i8v 2>&1 
+RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=ADDVv16i8v --benchmark-phase=assemble-measured-code 2>&1
 RUN: llvm-objdump -d %d > %t.s
 RUN: FileCheck %s --check-prefix=FPR128-ASM < %t.s
 FPR128-ASM:         <foo>:
 FPR128-ASM:         movi v{{[0-9]+}}.2d, #0000000000000000
 FPR128-ASM-NEXT:    addv b{{[0-9]+}}, v{{[0-9]+}}.16b
 
 ## FPR64 Register Class Initialization Testcase
-RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=ADDVv4i16v 2>&1
+RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=ADDVv4i16v --benchmark-phase=assemble-measured-code 2>&1
 RUN: llvm-objdump -d %d > %t.s
 RUN: FileCheck %s --check-prefix=FPR64-ASM < %t.s
 FPR64-ASM:          <foo>: