Tests for weighted merge of sample profiles.

1- Merge the foo and bar profiles with unity weight and verify the combined output
RUN: llvm-profdata merge -sample -text -weighted-input=1,%p/Inputs/weight-sample-bar.proftext -weighted-input=1,%p/Inputs/weight-sample-foo.proftext -o - | FileCheck %s -check-prefix=1X_1X_WEIGHT
RUN: llvm-profdata merge -sample -text -weighted-input=1,%p/Inputs/weight-sample-bar.proftext %p/Inputs/weight-sample-foo.proftext -o - | FileCheck %s -check-prefix=1X_1X_WEIGHT
1X_1X_WEIGHT-DAG: foo:1763288:35327
1X_1X_WEIGHT-DAG:  7: 35327
1X_1X_WEIGHT-DAG:  8: 35327
1X_1X_WEIGHT-DAG:  9: 6930
1X_1X_WEIGHT-DAG:  10: 29341
1X_1X_WEIGHT-DAG:  11: 11906
1X_1X_WEIGHT-DAG:  13: 18185 foo:19531
1X_1X_WEIGHT-DAG:  15: 36458
1X_1X_WEIGHT-DAG: bar:1772037:35370
1X_1X_WEIGHT-DAG:  17: 35370
1X_1X_WEIGHT-DAG:  18: 35370
1X_1X_WEIGHT-DAG:  19: 7005
1X_1X_WEIGHT-DAG:  20: 29407
1X_1X_WEIGHT-DAG:  21: 12170
1X_1X_WEIGHT-DAG:  23: 18150 bar:19829
1X_1X_WEIGHT-DAG:  25: 36666

2- Merge the foo and bar profiles with weight 3x and 5x respectively and verify the combined output
RUN: llvm-profdata merge -sample -text -weighted-input=3,%p/Inputs/weight-sample-bar.proftext -weighted-input=5,%p/Inputs/weight-sample-foo.proftext -o - | FileCheck %s -check-prefix=3X_5X_WEIGHT
3X_5X_WEIGHT-DAG: foo:8816440:176635
3X_5X_WEIGHT-DAG:  7: 176635
3X_5X_WEIGHT-DAG:  8: 176635
3X_5X_WEIGHT-DAG:  9: 34650
3X_5X_WEIGHT-DAG:  10: 146705
3X_5X_WEIGHT-DAG:  11: 59530
3X_5X_WEIGHT-DAG:  13: 90925 foo:97655
3X_5X_WEIGHT-DAG:  15: 182290
3X_5X_WEIGHT-DAG: bar:5316111:106110
3X_5X_WEIGHT-DAG:  17: 106110
3X_5X_WEIGHT-DAG:  18: 106110
3X_5X_WEIGHT-DAG:  19: 21015
3X_5X_WEIGHT-DAG:  20: 88221
3X_5X_WEIGHT-DAG:  21: 36510
3X_5X_WEIGHT-DAG:  23: 54450 bar:59487
3X_5X_WEIGHT-DAG:  25: 109998

3- Bad merge: invalid weight
RUN: not llvm-profdata merge -sample -weighted-input=3,%p/Inputs/weight-sample-bar.proftext -weighted-input=0,%p/Inputs/weight-sample-foo.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -sample -weighted-input=3,%p/Inputs/weight-sample-bar.proftext -weighted-input=0.75,%p/Inputs/weight-sample-foo.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -sample -weighted-input=3,%p/Inputs/weight-sample-bar.proftext -weighted-input=-5,%p/Inputs/weight-sample-foo.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -sample -weighted-input=3,%p/Inputs/weight-sample-bar.proftext -weighted-input=,%p/Inputs/weight-sample-foo.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
RUN: not llvm-profdata merge -sample -weighted-input=3,%p/Inputs/weight-sample-bar.proftext -weighted-input=%p/Inputs/weight-sample-foo.proftext -o %t.out 2>&1 | FileCheck %s -check-prefix=INVALID_WEIGHT
INVALID_WEIGHT: error: input weight must be a positive integer

4- Bad merge: input path does not exist
RUN: not llvm-profdata merge -sample -weighted-input=3,%p/Inputs/does-not-exist.proftext -weighted-input=2,%p/Inputs/does-not-exist-either.proftext -o %t.out 2>&1 | FileCheck -DMSG=%errc_ENOENT %s -check-prefix=INVALID_INPUT
INVALID_INPUT: {{.*}}: {{.*}}does-not-exist.proftext: [[MSG]]

5- No inputs
RUN: not llvm-profdata merge -sample -o %t.out 2>&1 | FileCheck %s -check-prefix=NO_INPUT
NO_INPUT: {{.*}}: no input files specified. See llvm-profdata{{(\.EXE|\.exe)?}} merge -help