Some very basic tests for the multiple input cases.

RUN: llvm-profdata merge %p/Inputs/foo3-1.proftext %p/Inputs/foo3-2.proftext -o %t
RUN: llvm-profdata show %t -all-functions -counts | FileCheck %s --check-prefix=FOO3
RUN: llvm-profdata merge %p/Inputs/foo3-2.proftext %p/Inputs/foo3-1.proftext -o %t
RUN: llvm-profdata show %t -all-functions -counts | FileCheck %s --check-prefix=FOO3
FOO3: foo:
FOO3: Counters: 3
FOO3: Function count: 8
FOO3: Block counts: [7, 6]
FOO3: Total functions: 1
FOO3: Maximum function count: 8
FOO3: Maximum internal block count: 7

RUN: llvm-profdata merge %p/Inputs/empty.proftext %p/Inputs/foo3-1.proftext -o %t
RUN: llvm-profdata show %t -all-functions -counts | FileCheck %s --check-prefix=FOO3EMPTY
FOO3EMPTY: foo:
FOO3EMPTY: Counters: 3
FOO3EMPTY: Function count: 1
FOO3EMPTY: Block counts: [2, 3]
FOO3EMPTY: Total functions: 1
FOO3EMPTY: Maximum function count: 1
FOO3EMPTY: Maximum internal block count: 3

RUN: llvm-profdata merge %p/Inputs/foo3-1.proftext %p/Inputs/foo3bar3-1.proftext -o %t
RUN: llvm-profdata show %t -all-functions -counts | FileCheck %s --check-prefix=FOO3FOO3BAR3
FOO3FOO3BAR3: foo:
FOO3FOO3BAR3: Counters: 3
FOO3FOO3BAR3: Function count: 3
FOO3FOO3BAR3: Block counts: [5, 8]
FOO3FOO3BAR3: bar:
FOO3FOO3BAR3: Counters: 3
FOO3FOO3BAR3: Function count: 7
FOO3FOO3BAR3: Block counts: [11, 13]
FOO3FOO3BAR3: Total functions: 2
FOO3FOO3BAR3: Maximum function count: 7
FOO3FOO3BAR3: Maximum internal block count: 13

RUN: llvm-profdata merge %p/Inputs/foo3-1.proftext %p/Inputs/bar3-1.proftext -o %t
RUN: llvm-profdata show %t -all-functions -counts | FileCheck %s --check-prefix=DISJOINT
DISJOINT: foo:
DISJOINT: Counters: 3
DISJOINT: Function count: 1
DISJOINT: Block counts: [2, 3]
DISJOINT: bar:
DISJOINT: Counters: 3
DISJOINT: Function count: 1
DISJOINT: Block counts: [2, 3]
DISJOINT: Total functions: 2
DISJOINT: Maximum function count: 1
DISJOINT: Maximum internal block count: 3