Improve the test distributors

1. Use "with" when opening files.
2. Add module docstrings.

Author: bd1976bris

llvm/test/ThinLTO/X86/dtlto/dtlto.test

@@ -14,15 +14,15 @@ RUN: opt t2.ll -o t2.o
 RUN: mkdir %t/out && cd %t/out
 
 # Define a substitution to share the common DTLTO arguments.
-DEFINE: %{command} =llvm-lto2 run ../t1.bc ../t2.bc -o t.o \
-DEFINE:     -dtlto \
-DEFINE:     -dtlto-remote-opt-tool=dummy \
-DEFINE:     -dtlto-distributor=%python \
-DEFINE:     -thinlto-distributor-arg=%llvm_src_root/utils/dtlto/mock.py \
-DEFINE:     -thinlto-distributor-arg=../t1.o \
-DEFINE:     -thinlto-distributor-arg=../t2.o \
-DEFINE:     -r=../t1.bc,t1,px \
-DEFINE:     -r=../t2.bc,t2,px
+DEFINE: %{command} = llvm-lto2 run ../t1.bc ../t2.bc -o t.o \
+DEFINE:   -dtlto \
+DEFINE:   -dtlto-remote-opt-tool=dummy \
+DEFINE:   -dtlto-distributor=%python \
+DEFINE:   -thinlto-distributor-arg=%llvm_src_root/utils/dtlto/mock.py \
+DEFINE:   -thinlto-distributor-arg=../t1.o \
+DEFINE:   -thinlto-distributor-arg=../t2.o \
+DEFINE:   -r=../t1.bc,t1,px \
+DEFINE:   -r=../t2.bc,t2,px
 
 # Perform DTLTO. mock.py does not do any compilation, instead it simply writes
 # the contents of the object files supplied on the command line into the

llvm/test/ThinLTO/X86/dtlto/imports.test

@@ -8,8 +8,7 @@ RUN: opt -thinlto-bc 1.ll -o 1.bc -O2
 
 # Define a substitution to share the common DTLTO arguments. Note that the use
 # of validate.py will cause a failure as it does not create output files.
-DEFINE: %{command} =llvm-lto2 run \
-DEFINE:    0.bc 1.bc -o t.o \
+DEFINE: %{command} = llvm-lto2 run 0.bc 1.bc -o t.o \
 DEFINE:    -dtlto \
 DEFINE:    -dtlto-remote-opt-tool=dummy \
 DEFINE:    -dtlto-distributor=%python \

llvm/test/ThinLTO/X86/dtlto/summary.test

@@ -12,7 +12,7 @@ RUN: opt t1.ll -o t1.o
 RUN: opt t2.ll -o t2.o
 
 # Define a substitution to share the common arguments.
-DEFINE: %{command} =llvm-lto2 run t1.bc t2.bc -o t.o \
+DEFINE: %{command} = llvm-lto2 run t1.bc t2.bc -o t.o \
 DEFINE:     -r=t1.bc,t1,px \
 DEFINE:     -r=t2.bc,t2,px \
 DEFINE:     -r=t2.bc,t1 \

llvm/test/ThinLTO/X86/dtlto/triple.test

@@ -13,14 +13,14 @@ RUN: opt t2.ll -o t2.o
 # Perform DTLTO. mock.py does not do any compilation, instead it emits the
 # object files supplied using -thinlto-distributor-arg in job order.
 RUN: not llvm-lto2 run t1.bc t2.bc -o t.o -save-temps \
-RUN:     -dtlto \
-RUN:     -dtlto-remote-opt-tool=dummy \
-RUN:     -dtlto-distributor=%python \
-RUN:     -thinlto-distributor-arg=%llvm_src_root/utils/dtlto/mock.py \
-RUN:     -thinlto-distributor-arg=t1.o \
-RUN:     -thinlto-distributor-arg=t2.o \
-RUN:     -r=t1.bc,t1,px \
-RUN:     -r=t2.bc,t2,px 2>&1 | FileCheck %s
+RUN:   -dtlto \
+RUN:   -dtlto-remote-opt-tool=dummy \
+RUN:   -dtlto-distributor=%python \
+RUN:   -thinlto-distributor-arg=%llvm_src_root/utils/dtlto/mock.py \
+RUN:   -thinlto-distributor-arg=t1.o \
+RUN:   -thinlto-distributor-arg=t2.o \
+RUN:   -r=t1.bc,t1,px \
+RUN:   -r=t2.bc,t2,px 2>&1 | FileCheck %s
 
 # This check ensures that we have failed for the expected reason.
 CHECK: failed: DTLTO backend compilation: all triples must be consistent