misched-load-clustering.ll: exercise new clustering flags

- add store-clustering=false to the existing LDCLUSTER test;
- add a new STCLUSTER test with load-clustering=false;
- add a new DEFAULTCLUSTER test with default clustering options.

Author: danielhb

llvm/test/CodeGen/RISCV/misched-load-clustering.ll

@@ -7,12 +7,31 @@
 ; RUN:     -riscv-misched-store-clustering=false \
 ; RUN:     -debug-only=machine-scheduler -o - 2>&1 < %s \
 ; RUN:   | FileCheck -check-prefix=NOCLUSTER %s
+;
+; RUN: llc -mtriple=riscv32 -verify-misched \
+; RUN:     -riscv-misched-load-clustering=false \
+; RUN:     -debug-only=machine-scheduler -o - 2>&1 < %s \
+; RUN:   | FileCheck -check-prefix=STCLUSTER %s
+; RUN: llc -mtriple=riscv64 -verify-misched \
+; RUN:     -riscv-misched-load-clustering=false \
+; RUN:     -debug-only=machine-scheduler -o - 2>&1 < %s \
+; RUN:   | FileCheck -check-prefix=STCLUSTER %s
+;
 ; RUN: llc -mtriple=riscv32 -verify-misched \
+; RUN:     -riscv-misched-store-clustering=false \
 ; RUN:     -debug-only=machine-scheduler -o - 2>&1 < %s \
 ; RUN:   | FileCheck -check-prefix=LDCLUSTER %s
 ; RUN: llc -mtriple=riscv64 -verify-misched \
+; RUN:     -riscv-misched-store-clustering=false \
 ; RUN:     -debug-only=machine-scheduler -o - 2>&1 < %s \
 ; RUN:   | FileCheck -check-prefix=LDCLUSTER %s
+;
+; RUN: llc -mtriple=riscv32 -verify-misched \
+; RUN:     -debug-only=machine-scheduler -o - 2>&1 < %s \
+; RUN:   | FileCheck -check-prefix=DEFAULTCLUSTER %s
+; RUN: llc -mtriple=riscv64 -verify-misched \
+; RUN:     -debug-only=machine-scheduler -o - 2>&1 < %s \
+; RUN:   | FileCheck -check-prefix=DEFAULTCLUSTER %s
 
 
 define i32 @load_clustering_1(ptr nocapture %p) {
@@ -24,13 +43,29 @@ define i32 @load_clustering_1(ptr nocapture %p) {
 ; NOCLUSTER: SU(4): %4:gpr = LW %0:gpr, 4
 ; NOCLUSTER: SU(5): %6:gpr = LW %0:gpr, 16
 ;
+; STCLUSTER: ********** MI Scheduling **********
+; STCLUSTER-LABEL: load_clustering_1:%bb.0
+; STCLUSTER: *** Final schedule for %bb.0 ***
+; STCLUSTER: SU(1): %1:gpr = LW %0:gpr, 12
+; STCLUSTER: SU(2): %2:gpr = LW %0:gpr, 8
+; STCLUSTER: SU(4): %4:gpr = LW %0:gpr, 4
+; STCLUSTER: SU(5): %6:gpr = LW %0:gpr, 16
+;
 ; LDCLUSTER: ********** MI Scheduling **********
 ; LDCLUSTER-LABEL: load_clustering_1:%bb.0
 ; LDCLUSTER: *** Final schedule for %bb.0 ***
 ; LDCLUSTER: SU(4): %4:gpr = LW %0:gpr, 4
 ; LDCLUSTER: SU(2): %2:gpr = LW %0:gpr, 8
 ; LDCLUSTER: SU(1): %1:gpr = LW %0:gpr, 12
 ; LDCLUSTER: SU(5): %6:gpr = LW %0:gpr, 16
+;
+; DEFAULTCLUSTER: ********** MI Scheduling **********
+; DEFAULTCLUSTER-LABEL: load_clustering_1:%bb.0
+; DEFAULTCLUSTER: *** Final schedule for %bb.0 ***
+; DEFAULTCLUSTER: SU(4): %4:gpr = LW %0:gpr, 4
+; DEFAULTCLUSTER: SU(2): %2:gpr = LW %0:gpr, 8
+; DEFAULTCLUSTER: SU(1): %1:gpr = LW %0:gpr, 12
+; DEFAULTCLUSTER: SU(5): %6:gpr = LW %0:gpr, 16
 entry:
   %arrayidx0 = getelementptr inbounds i32, ptr %p, i32 3
   %val0 = load i32, ptr %arrayidx0