[llvm-cov] Add the project summary to each source file coverage report.

This patch includes the following changes:
- Included header "Code coverage report" and include the date that the report was created.
- Included title (as specified in a command line option, (i.e llvm-cov  -project-title="Simple Test")
- In the summary, list the elf files that the source code file has contributed to.
- Used column heading for "Line No.", "Count No.", Source".

Differential Revision: https://reviews.llvm.org/D23345

llvm-svn: 279628
diff --git a/llvm/test/tools/llvm-cov/showTemplateInstantiations.cpp b/llvm/test/tools/llvm-cov/showTemplateInstantiations.cpp
index 198ebd3..5a656db 100644
--- a/llvm/test/tools/llvm-cov/showTemplateInstantiations.cpp
+++ b/llvm/test/tools/llvm-cov/showTemplateInstantiations.cpp
@@ -13,7 +13,7 @@
 }                    // ALL-NEXT:    [[@LINE]]| 2|}
 
                      // SHARED:       {{^ *(\| )?}}_Z4funcIbEiT_:
-                     // SHARED-NEXT:  [[@LINE-9]]| 1|int func(T x) {
+                     // SHARED:       [[@LINE-9]]| 1|int func(T x) {
                      // SHARED-NEXT:  [[@LINE-9]]| 1|  if(x)
                      // SHARED-NEXT:  [[@LINE-9]]| 1|    return 0;
                      // SHARED-NEXT:  [[@LINE-9]]| 1|  else
@@ -23,7 +23,7 @@
 
                      // ALL:         {{^ *}}| _Z4funcIiEiT_:
                      // FILTER-NOT:  {{^ *(\| )?}} _Z4funcIiEiT_:
-                     // ALL-NEXT:    [[@LINE-19]]| 1|int func(T x) {
+                     // ALL:         [[@LINE-19]]| 1|int func(T x) {
                      // ALL-NEXT:    [[@LINE-19]]| 1|  if(x)
                      // ALL-NEXT:    [[@LINE-19]]| 0|    return 0;
                      // ALL-NEXT:    [[@LINE-19]]| 1|  else
@@ -56,7 +56,7 @@
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='uncovered-line'><pre>0</pre></td><td class='code'><pre>
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-44]]'><pre>[[@LINE-44]]</pre></a></td><td class='covered-line'><pre>2</pre></td><td class='code'><pre>}
 
-// HTML-SHARED: <div class='source-name-title'><pre>_Z4funcIbEiT_</pre></div><table>
+// HTML-SHARED: <div class='source-name-title'><pre>Function: _Z4funcIbEiT_</pre></div>
 // HTML-SHARED: <td class='line-number'><a name='L[[@LINE-53]]'><pre>[[@LINE-53]]</pre></a></td><td class='covered-line'><pre>1</pre></td><td class='code'><pre>int func(T x) {
 // HTML-SHARED: <td class='line-number'><a name='L[[@LINE-53]]'><pre>[[@LINE-53]]</pre></a></td><td class='covered-line'><pre>1</pre></td><td class='code'><pre>  if(x)
 // HTML-SHARED: <td class='line-number'><a name='L[[@LINE-53]]'><pre>[[@LINE-53]]</pre></a></td><td class='covered-line'><pre>1</pre></td><td class='code'><pre>    ret
@@ -65,7 +65,7 @@
 // HTML-SHARED: <td class='line-number'><a name='L[[@LINE-53]]'><pre>[[@LINE-53]]</pre></a></td><td class='uncovered-line'><pre>0</pre></td><td class='code'><pre>
 // HTML-SHARED: <td class='line-number'><a name='L[[@LINE-53]]'><pre>[[@LINE-53]]</pre></a></td><td class='covered-line'><pre>1</pre></td><td class='code'><pre>}
 
-// HTML-ALL: <div class='source-name-title'><pre>_Z4funcIiEiT_</pre></div><table>
+// HTML-ALL: <div class='source-name-title'><pre>Function: _Z4funcIiEiT_</pre></div>
 // HTML-FILTER-NOT: <div class='source-name-title'><pre>_Z4funcIiEiT_</pre></div><table>
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-63]]'><pre>[[@LINE-63]]</pre></a></td><td class='covered-line'><pre>1</pre></td><td class='code'><pre>int func(T x) {
 // HTML-ALL: <td class='line-number'><a name='L[[@LINE-63]]'><pre>[[@LINE-63]]</pre></a></td><td class='covered-line'><pre>1</pre></td><td class='code'><pre>  if(x)