[CostModel][AArch64] Remove unused check-prefix

Author: RKSimon

llvm/test/Analysis/CostModel/AArch64/aggregates.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
-; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -cost-model -cost-kind=throughput -analyze | FileCheck %s --check-prefixes=ALL,THROUGHPUT
-; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -cost-model -cost-kind=latency -analyze | FileCheck %s --check-prefixes=ALL,LATENCY
-; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -cost-model -cost-kind=code-size -analyze | FileCheck %s --check-prefixes=ALL,CODESIZE
+; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -cost-model -cost-kind=throughput -analyze | FileCheck %s --check-prefix=THROUGHPUT
+; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -cost-model -cost-kind=latency -analyze | FileCheck %s --check-prefix=LATENCY
+; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -cost-model -cost-kind=code-size -analyze | FileCheck %s --check-prefix=CODESIZE
 
 define i32 @extract_first_i32({i32, i32} %agg) {
 ; THROUGHPUT-LABEL: 'extract_first_i32'