Add Tests to check if adding space doesn't break invocation

Author: RAJAGOPALAN-GANGADHARAN

test/Driver/linker.swift

@@ -19,6 +19,9 @@
 // RUN: %swiftc_driver -sdk "" -driver-print-jobs -target x86_64-unknown-linux-gnu -Ffoo -Fsystem car -F cdr -framework bar -Lbaz -lboo -Xlinker -undefined %s 2>&1 > %t.linux.txt
 // RUN: %FileCheck -check-prefix LINUX-x86_64 %s < %t.linux.txt
 
+// RUN: %swiftc_driver -sdk "" -driver-print-jobs -target x86_64-unknown-linux-gnu -Ffoo -Fsystem car -F cdr -framework bar -Lbaz -l boo -Xlinker -undefined %s 2>&1 > %t.linux.txt
+// RUN: %FileCheck -check-prefix LINUX-lib-flag-space %s < %t.linux.txt
+
 // RUN: %swiftc_driver -sdk "" -driver-print-jobs -target armv6-unknown-linux-gnueabihf -Ffoo -Fsystem car -F cdr -framework bar -Lbaz -lboo -Xlinker -undefined %s 2>&1 > %t.linux.txt
 // RUN: %FileCheck -check-prefix LINUX-armv6 %s < %t.linux.txt
 
@@ -217,6 +220,22 @@
 // LINUX-x86_64-DAG: -Xlinker -undefined
 // LINUX-x86_64: -o linker
 
+// LINUX-lib-flag-space: swift
+// LINUX-lib-flag-space: -o [[OBJECTFILE:.*]]
+
+// LINUX-lib-flag-space: clang{{(\.exe)?"? }}
+// LINUX-lib-flag-space-DAG: -pie
+// LINUX-lib-flag-space-DAG: [[OBJECTFILE]]
+// LINUX-lib-flag-space-DAG: -lswiftCore
+// LINUX-lib-flag-space-DAG: -L [[STDLIB_PATH:[^ ]+(/|\\\\)lib(/|\\\\)swift(/|\\\\)]]
+// LINUX-lib-flag-space-DAG: -Xlinker -rpath -Xlinker [[STDLIB_PATH]]
+// LINUX-lib-flag-space-DAG: -F foo -iframework car -F cdr
+// LINUX-lib-flag-space-DAG: -framework bar
+// LINUX-lib-flag-space-DAG: -L baz
+// LINUX-lib-flag-space-DAG: -lboo
+// LINUX-lib-flag-space-DAG: -Xlinker -undefined
+// LINUX-lib-flag-space: -o linker
+
 // LINUX-armv6: swift
 // LINUX-armv6: -o [[OBJECTFILE:.*]]